EAETHQUAKES ON THE PACIFIC COAST 207 



1892. July 9; Oakland. 



Mr, Charles Burckhalter reports that the seismograph at the 

 Chabot Observatory showed a V-shaped mark about 4 mm. in 

 height. 



1892. Jnly 16; Mount Hamilton. 



Prof. Holden reports a shock at 12.6.34 ± p. m. P. S. T. Intensity 

 = III on the Eossi-Forel scale. The duplex seismograph shows 

 a small mark about 1.5 mm. north and south by 1 mm. east and 

 west. 



1892. July 22; Carson City; 6:50 a. m. 



N. W. and S. E. tremor.— C. W. F. 



1892. Jnly 24; Colton. 



The San Francisco Examiner reports a shock of earthquake at tliis 

 point at 6 a. m. 



1892. Jnly 26; Napa. 



" A heavy shock " at 2.10 a. m. Vibrations north to south. No 

 damage. 



1892. Jnly 26; Petalnma. 



" Quite a lively shock." Vibrations east to west. 



1892. Jnly 26; San Francisco. 



A slight shock 2h. 8m. a. m. Duration 2 sec. — T. T. 



1892. Jnly 26; Monnt Hamilton. 



The duplex seismograph shows a light shock, the displacement of 

 the pen in a north and south direction being 1 mm. and in an 

 east and west direction 2 mm. The shock was not felt by any 

 one. 



1892. Jnly 26; Berkeley. 



Slight record. — Professor Soule. 



1892. Jnly 26; Fort Point Lishtbonse; 2:04 a. m. 



Moderate, lasting- 10 sec. A very light shock at 2.59 a. m. 



1892. Ansnst 1 or 2; Monnt Hamilton. 



A shock occurred August 1 or 2 and was found recorded on both 

 seismographs, not being of sufficient intensity to start the Ew- 

 ing instrument, and no one felt it. Displacement of duplex pen 

 northwest and southeast, 4 mm. Almost a straight line. 



1892. Angast 2 or 3; Monnt Hamilton. 



Another slight shock was found recorded by the duplex, but was 

 not felt by any one here. Displacement of pen east and west, 

 3 mm. Almost a straight line. 



